LETTERS AND SIGNS. 



Iv, larva. 



Iz, lateral muscles. 



w, mouth. 



md, mandibles. 



?nx', 1st pair of maxillae. 



tnx", 2d pair of maxillae. 



;/, tergum of nth ring. 



;;', tip of tergum. 



nr, nervous cord. 



jir' , nerve. 



0, podical plate. 



oc, median ocellus. 



oc', lateral ocellus. 



oe, cesophagus. 



oeb, oesophageal bulb. 



OS, ovipositor. 



os' \ 



os" ^ parts of ovipositor. 



os>" ) 



ot, ocular trachea. 



ov, ovary. 



ov.t., oviduct. 



ov.t.' , site of oviduct. 



/, cerci. 



pgl, paraglossK. 



ph, pharynx. 



//, pulvillus. 



post, posterior. 



pv, pharyngeal valve. 





thoracic air-sacs. 



(f~~, abdominal air-sacs. 

 r, neck of egg-pod. 

 TO, chitinous rods. 

 s^~^'^, spiracles. 

 sal, salivary gland. 

 sb, sebaceous gland. 

 sc, scale. 



sd, salivary duct. 



sCj caudal setce. 



sg, ganglion. 



sm, sympathetic nerve. 



sp, supra-oesophageal ganglion. 



spn, spinneret. 



st, stigmatal trachea. 



sit, sucking-tube. 



sut, suture. 





f- |- scutum of thoracic rings. 



/3. 



tb, tibia. 



tc, trochanter. 



///, trachea. 



tn, tongue. 



tp, stipes. 



tr, tarsus. 



^ I scutellum of thoracic 

 ts^ 



ts^ \ 



rmgs. 



tu, respiratory tubes. 



libt, submentum. 



ur, urinary tubes. 



V, horny spikes. 



vm, velum. 



vt, ventral trachea. 



w\ 1st pair of wings. 



7t'", 2d pair of wings. 



x^ , palpi of I St pair of maxillae. 



.r", palpi of 2d pair of maxillae. 



x^h, muscles of x^' . 



y, horny plate. 



z, muscles. 



^ , male. 



9 , female. 



9 , worker bee. 



\, enlarged two diameters. 



